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Multiplication in Base Twelve | Dozenal Society of America
Duodecimal - Wikipedia
Duodecimal: The Base-12 Counting System
Duodecimal Numbers (Base 12) | Examples, questions, answers
Multiplying Duodecimal Numbers (Base 12) (A) - Math-Drills
Duodecimal Definition (Illustrated Mathematics Dictionary)
Multiplication Tables of Various Bases - Dozenal